Side interest story.
My neighbour is an outdoorsman. Hunting, fishing and you will find him there. He drives a 7.3 Power Stroke F250. One time his battery was too low to start the bid Diesel. He was 100km from help. He took the blade off his chainsaw and ran the chain over the alternator pulley. He was ready to start in 15 minutes
Do you know a DELCO (GM) alternator can be used to charge a battery, when it is powered by a power source. A small engine or electric motor works.